MIL-STD-1477 Symbols for Army System Displays MetricThis standard prescribes the physical characteristics of ground and air track symbols, unit/installation symbols, control measures symbols, equipment symbols, and associated alphanumeric information for U.S. Army Combined Arms system displays which are generated by electronic, optic, or infrared technology and presents information in real time or near-real time.

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MIL-STD-1477C(MI)

5.1.3.1 Track symbols and modifiers. A capability for track symbols and associated track modifiers to blink in response to certain conditions and to discontinue blinking when the conditions no longer exist, or when appropriate operation action is taken, shall be provided. Only the track symbol and associated modifiers shall blink. The alphanumeric data associated with the track symbol shall not blink.

5.1.3.2 Rate. No more than two blink rates shall be used. Where only one rate is used, the rate shall be not less than 4 nor more than 5 Hz. When two rates are used, the second rate shall be no less than 1 nor more than 2 Hz.

5.1.3.3 Application. The higher blink rate shall normally be used as the highest priority track indicator on tracks which require urgent operator attention (e.g., rack recommended for engagement by the system, identification conflict, pop-up engageable hostiles ). Only one system at a time shall be blinked at the higher rate. The lower blink rate, if required, shall be used for alerting operator to a single class of less urgent tracks (e.g., a new hostile or unknown track entering the operator's area of interest). Only one symbol at a time shall be blinked at the lower rate.

5.1.3.4 Non-track symbols. Blinking of symbols for ground units, installations, equipment, and control measures shall be blinked at the lower rate and shall indicated an updated or new location or status. Only one symbol at a time shall be blinked. Where units and tracks are simultaneously displayed, the blinking of a track takes precedence. Alphanumeric data shall not be blinked.

5.1.4 Hooking. Hooking action shall be displayed by reverse video, brackets, or a box. Irrespective hooking method, only one symbol at a time shall be capable of being hooked.

5.1.4.1 Reverse video. If possible, normally light symbols (and modifiers) on a dark background shall be capable of being switched to dark symbols (and modifiers)

on a light background (or vise-versa).

5.1.4.1.1 Application. A symbol may be depicted in reverse video in response to certain conditions. Reverse video shall be used to indicate that a symbol has been selected by the operator to receive further action (e.g., selected (hooked) to access more information on a track or unit). When the conditions no longer exist or upon termination of the action, the symbol background polarity shall return to normal.

5.1.4.1.2 Shape. When reverse video is used, the display area affected shall be in the shape of a square surrounding the basic symbol and associated modifiers on all sides by at least one stroke width of a line.

5.1.4.2 Brackets. If a capability to depict symbols in reverse video is not provided, brackets ([ ]) shall be used as an alternative to indicate that a symbol has been selected.